The Extreme USB 2.0 Reader provides you with a complete Digital solution for your photography needs. Its performs at up to 20MB per seconds sequential read and write, above the level needed for the high enthusiast photographer. It's designed with two slots and supports CF (Type I and II), SD, MS Pro, and MS PRO Duo. It supports USB 2.0 Connectivity on both Windows and Macintosh Operating Systems. It plugs and plays with no external AC power.